What is the essence of the decomposition and synthesis of force in the first year of physics in senior one

What is the essence of the decomposition and synthesis of force in the first year of physics in senior one

The essence is to make students deeply understand the concept of "vector", that is, quantity with both size and direction
Force is a vector, the effect of a force can be divided into the effect of multiple forces. On the contrary, the effect of multiple forces can be equivalent to the effect of a force
In mathematical calculation, the essence is to let students learn simple parallelogram rule, that is, simple vector addition and subtraction